Uniden PRO401HH Handheld CB Radio [PRO401HH]PRO401HH Handheld CB Radio The Uniden PRO401HH combines the convenience of a handheld CB radio with an extremely long range, ensuring that the user is never out of touch. It operates on any of the 40 AM frequencies authorized by the FCC. This CB radio features a superheterodyne circuit with phase locked loop technology for precise frequency control. Users also get Auto Noise Cancel to reduce pulse noise and Squelch Control for high quality sound.